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N
NC - abbreviation for National Coarse; a measurement of threads per inch on a tap.
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NEF - abbreviation for National Extra Fine; a measurement of threads per inch on a tap.
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NF - abbreviation for National Fine; a measurement of threads per inch on a tap.
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Non-marring - preventing marks or indentations on an object.
See:
Clamps
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NPT - abbreviation for National Pipe Taper. A measurement of threads per inch on threaded pipe.
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NS - abbreviation for National Special.
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